One of the most INSANE cards ever created — featuring signatures from eight sports legends including Conor McGregor and Floyd Mayweather — has just hit the auction block, and it could sell for the price of a brand-new car!!

The piece is wild — it’s got autographs from McGregor, Mayweather, Giannis Antetokounmpo, Steph Curry, Errol Spence Jr., Lionel Messi, Cristiano Ronaldo and Chloe Kim on it … and Leaf Trading Cards says it’s the only one of its kind ever created.

Learned bidding on the card at Goldin Auctions just began this week — and we’re told the expectation is for it to ultimately sell later this month for somewhere around $20,000!!

And, given the names on the piece — and how Giannis’ star has absolutely exploded this summer — seems like a pretty great price to us.

As for how the card was obtained … we’re told someone actually pulled it in a box break — which, yeah, talk about great luck.

The card was given an 8 grade by Beckett … with a perfect 10 for its sharp corners.

Auction ends in 9 days … happy bidding!